Journal article
Iridium Incorporation into MnO2 for an Enhanced Electrocatalytic Oxygen Evolution Reaction
ChemCatChem, v 15(8), pn/a
21 Apr 2023
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We have investigated the structure and activity of electrocatalysts for the oxygen evolution reaction (OER) that had low loadings of Ir incorporated into the 2D layered MnO2, (birnessite, nominally delta-MnO2) and the 3D MnO2 (pyrolusite, beta-MnO2). The Ir-incorporated beta-MnO2 (Ir/beta-MnO2) electrocatalysts were prepared for the first time via a thermally induced phase transition of delta-MnO2 containing 16-22 wt% Ir. This phase transition of delta-MnO2 to beta-MnO2 was facilitated by the presence of Ir in the structure, as both Ir in IrO2 and Mn in beta-MnO2 could adopt a thermodynamically favored rutile structure. Extended X-ray absorption fine structure (EXAFS) of Ir/beta-MnO2 showed that the catalyst consisted of Ir substituted into the crystalline beta-MnO2 lattice. 22 wt% Ir/beta-MnO2 (60 mu g(Ir)cm(geo)(-2) exhibited an OER overpotential ( eta ) of 337 mV, lower than the eta for commercial IrO2. This eta was constant for 6 h, at 10 mA cm(geo)(-2) in 0.5 M H2SO4. EXAFS, high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption near edge structure (XANES) showed that 22 wt% Ir/beta-MnO2 had a strained structure containing similar to 41 % Mn3+, an OER active species, along with a modified Ir bond covalency consisting of both Ir-O-Ir and Ir-O-Mn.
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Details
- Title
- Iridium Incorporation into MnO2 for an Enhanced Electrocatalytic Oxygen Evolution Reaction
- Creators
- Uddipana Kakati - Temple UniversityEvert J. J. Elzinga - Rutgers, The State University of New JerseyZachary R. R. Mansley - Brookhaven National LaboratoryBenjamin Roe - Temple UniversityFarbod Alimohammadi - Drexel University, Materials Science and EngineeringGregory Schwenk - Drexel University, Materials Science and EngineeringJinliang Ning - Tulane UniversityYimei Zhu - Brookhaven National LaboratoryHai-Feng Ji - Drexel University, Materials Science and EngineeringJianwei Sun - Tulane UniversityDaniel R. R. Strongin - Temple UniversityArgonne National Laboratory (ANL), Argonne, IL (United States)
- Publication Details
- ChemCatChem, v 15(8), pn/a
- Publisher
- Wiley
- Number of pages
- 12
- Grant note
- Office of Vice President for Research at Temple University DESC0012704 / U.S. DOE-BES, Materials Sciences and Engineering Division; United States Department of Energy (DOE) DE-AC02-06CH11357 / DOE office of Science by Argonne National Laboratory; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; Chemistry
- Web of Science ID
- WOS:000958861500001
- Scopus ID
- 2-s2.0-85151296215
- Other Identifier
- 991021861297204721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical